Astrobiology is a science which, until recently, was without any evidence. Even now,

the only place in the entire Universe where we know for certain that life exists is this

planet. So, as we search for life elsewhere, what clues can we glean from life on

Earth? From the biggest to the smallest, highest to the lowest let’s explore what we

know and what that tells us about the possibility of life surviving in other places apart

from our home planet and why we should never set foot on Mars.